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Related Experiment Videos

Design principles underlying circadian clocks.

D A Rand1, B V Shulgin, D Salazar

  • 1Interdisciplinary Programme in Cellular Regulation & Mathematics Institute, Coventry CV4 7AL, UK. dar@maths.warwick.ac.uk

Journal of the Royal Society, Interface
|July 20, 2006
PubMed
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Complex regulatory networks, like circadian clocks, use interconnected feedback loops to achieve essential functions. This study shows network complexity provides flexibility for robust performance and stability, suggesting hidden simplicity in their design.

Area of Science:

  • Systems Biology
  • Computational Biology
  • Biophysics

Background:

  • Regulatory networks, particularly circadian clocks, exhibit complex structures with interconnected positive and negative feedback loops.
  • Understanding the relationship between the form (structure) and function (properties) of these networks is a fundamental challenge.
  • Existing research speculates on the reasons for this complexity, but a definitive explanation is lacking.

Purpose of the Study:

  • To analyze the flexibility of circadian clock networks.
  • To investigate the relationships between key properties like robust entrainment, temperature compensation, and stability.
  • To explain how network complexity enables simultaneous attainment of multiple crucial circadian clock properties.

Main Methods:

Related Experiment Videos

  • Analysis of regulatory network flexibility and desirable properties.
  • Utilizing infinitesimal response curves to quantify evolutionary aims.
  • Investigating stability against environmental variations and parameter fluctuations.

    • Main Results:

    • Network complexity provides the necessary flexibility to achieve multiple key properties of circadian clocks simultaneously.
    • Infinitesimal response curves are shown to be a useful tool for analyzing regulatory networks.
    • Apparent complexity in regulatory and signaling networks may mask lower intrinsic flexibility and dimensionality.

    Conclusions:

    • The intricate structure of circadian clocks is essential for their robust function and stability.
    • Network complexity is a design principle that allows for the simultaneous optimization of multiple biological objectives.
    • The developed analytical tools offer a novel approach to understanding regulatory network design principles.